单点登录 关于Cookie跨域的问题

public void ProcessRequest(HttpContext context)
{
HttpCookie cookie = new HttpCookie("name", "www.Admin10000.com");
cookie.Domain = "test2.com";
cookie.Path = "/";
cookie.Expires = DateTime.Now.AddMinutes(10000);
context.Response.Cookies.Add(cookie);

context.Response.ContentType = "text/plain";
context.Response.AddHeader("P3P", "CP=CAO PSA OUR");
context.Response.Write("");
}

public bool IsReusable
{
get
{
return false;
}
}